CN109231464A - A kind of modularization agricultural drain step purification total nitrogen removal system and method - Google Patents

A kind of modularization agricultural drain step purification total nitrogen removal system and method Download PDF

Info

Publication number
CN109231464A
CN109231464A CN201811090868.XA CN201811090868A CN109231464A CN 109231464 A CN109231464 A CN 109231464A CN 201811090868 A CN201811090868 A CN 201811090868A CN 109231464 A CN109231464 A CN 109231464A
Authority
CN
China
Prior art keywords
purification
denitrification
nitrification
pattern block
weir plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201811090868.XA
Other languages
Chinese (zh)
Other versions
CN109231464B (en
Inventor
沈晓笑
马吴成
邵孝侯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hohai University HHU
Original Assignee
Hohai University HHU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hohai University HHU filed Critical Hohai University HHU
Priority to CN201811090868.XA priority Critical patent/CN109231464B/en
Publication of CN109231464A publication Critical patent/CN109231464A/en
Application granted granted Critical
Publication of CN109231464B publication Critical patent/CN109231464B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/32Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment

Abstract

The invention discloses a kind of modularization agricultural drain step purification total nitrogens to remove system and method, which includes sequentially connected farmland, S type denitrification purification system, ecological ditch and step nitrification.S pattern block denitrification purification system includes side board and the denitrification purifying area that is separated by intermediate bulkhead;Ecological ditch includes the adjusting weir plate in plant purification area and end setting;Step nitrification purification system includes the nitrification purifying area that fixed weir plate and replaceable weir plate separate.Farmland discharges nitric wastewater and nitrifies purification system for mineralized nitrogen into nitrate nitrogen and nitrite nitrogen in step, and nitrate nitrogen and nitrite nitrogen are converted to nitrogen in S pattern block denitrification purification system.The quantity of S pattern block denitrification purification system and the quantity of replaceable weir plate are adjustable.Adaptation to local conditions of the present invention realizes that original position efficient denitrification purification, stability height, flexible operation, small investment, operating cost are low;Technological operation is simple, ecological environment benefit is good.

Description

A kind of modularization agricultural drain step purification total nitrogen removal system and method
Technical field
The invention belongs to environmental protection and water remediation fields, and in particular to a kind of modularization agricultural drain step purification total nitrogen is gone Except method.
Background technique
As China's planting industry develops rapidly, farmland planting industry chemical fertilizer application dosage is continuously increased, nitrogen in agricultural land soil Content and the nitrogen of loss are continuously increased, and are caused the water pollution on farmland periphery to aggravate, are led to water eutrophication.Farmland face source region Domain area is big, range is wide, difficulty of governance is big, periodicity is long.In practice, peasant household devotes exclusive attention to output greatly, implements nitrogenous fertilizer and exceeds plant Growth actual demand amount, pollution of area source aggravation.Currently, farmland face source mainly use liquid manure control technology, ecological intercepting technology, Chemical treatment method etc..That there are enforcement difficulties is big, costly for these technologies, is lack of pertinence difference, and treatment effect is unstable.
201711460239.7 rice field nitrogen phosphorus runoff of application number is lost monitoring and prior-warning device and its application method, is related to ring Border monitoring technical field.The device is made of sampling detector 1, monitoring sensor 2, data processor 3 and user terminal 4.This Invention is lost the randomness and uncertainty occurred for rice field nitrogen phosphorus runoff, overcomes nitrogen phosphorus total nitrogen, total phosphorus in paddy field drainage Monitor difficult problem, pH, dissolved oxygen, oxidation-reduction potential, temperature, conductivity, salt directly in measurement paddy field drainage runoff Degree, chlorophyll and suspended solid parameter measure total nitrogen and total phosphorus indirectly, and according to total nitrogen, total phosphorus concentration real-time early warning, realize The real-time monitoring and nitrogen and phosphorus loss Risk-warning of paddy field drainage water quality, provide scientific basis for the decision of environment administrator, are agriculture Industry Ides On Prevention And Control of Regional Pollution provides equipment and supports.But this method is only that nitrogen phosphorus runoff is lost monitoring method, does not have and how proposes nitrogen phosphorus Control.
Application number 201711189976.8, a kind of agricultural area source pollutants enter river load and cut down system.The system includes: to converge Ditch, decontamination cycle canal, the precipitating pool, first enter river load monitoring device, time monitoring device, second enter river load monitoring device And remote terminal.The present invention passes through nitrogen phosphorus adsorbent equipment and circulating pump in annular water purification circulation canal and is used for effectively to nitrogen and phosphorus pollution It is cut down, water purification circulation canal and precipitating pool bank and the internal various plants planted can effectively cut down heavy metal pollution and its He pollutes, so that targetedly effectively cut down to the agricultural drain pollution for entering receiving water body;Pass through simultaneously It controls the working condition of each gate and obtains terminal agricultural area source pollutants and enter river load, to keep under strict control into receiving water body Water quality;Further, according to the difference of nitrogen and phosphorus load amount, the difference of the difference of heavy metal load amount and other pollutant burden amounts, And the sedimentation time is combined, reliable basis is provided for reasonably adjusting for this system.But this method treatment effect stability is poor, operation Complex management etc..
Application number 201611103198.1, a kind of non-point source pollution control method based on preserving soil moisture principle, including along Gentle slope slope aspect does the identical contour of several spacing, in section flood that setting avoids runoff rate excessive on top contour Annular groove plants several crops in vertical cut on big vast annular groove gentle slope contour below, uniform kind between the crop of interval plantation Green manure is planted, several runoff guides path is opened up between crop and green manure, setting is connected to runoff guide path under gentle slope, is made The orchard of processing buffer strip is polluted for face, is evenly distributed with several runoff guides path in orchard, runoff guide path connects outward The logical pretreatment pool for intercepting solid impurity, the ecological fish pond that pretreatment pool passes through the nutrients such as setting pot and recycling nitrogen phosphorus Connection.But this method is for total nitrogen poor removal effect, stability is not high, takes up a large area.
Application number 201610704824.6, a kind of construction method for the more pool systems controlling agricultural non-point source pollution, i.e., in heat Band, subtropical zone construct more pool systems, which includes multiple farmland Water warfares pool unit;Each farmland Water warfare pool Unit includes farmland, the purification of water quality pool and pumping plant, and specific steps include: that S1 determines aggregate storage capacity, and S2 determines subregion storage capacity, S3 structure More pool systems in subregion are built, S4 is connected to each subregion and forms more pool systems.The present invention has rainy season water storage, purification, and dry season is reduced The amount of irrigating by lifting water to a higher level with a water pump, etc. and the advantages of purify farmland return water.But this method takes up a large area, invests big, operating cost height, total nitrogen removal effect It is low.
Application number 201610298724.8, a method of Coastal beach alkaline land soil being improved using charcoal bed course, Disclose a kind of method using charcoal bed course improvement Coastal beach alkaline land soil, comprising: planning upgrading unit and improvement Cell excavates improvement cell topsoil to 40~50cm, is laid with the charcoal bed course of 10~20cm thickness, backfills surface soil, certainly Right rainfall elutes salt discharge 3~5 times.The method of the present invention is easy, the improvement period is short, effect stability, without secondary pollution.Effectively changing While good alkaline land soil, the use of charcoal bed course can also effectively control agricultural non-point source pollution simultaneously, promote alkaline land soil Improvement and agroecological benign development.Present invention can apply to the improvement of Coastal beach alkaline land soil, the soil after improvement It can be used for rice cultivation, wheat or saline and alkaline resource plant etc..But this method takes up a large area, invests big, operating cost height, to total Nitrogen removal is lack of pertinence.
A kind of efficient closure works system of the agricultural non-point source pollution of application number 201610259032.2 and control method, disclose one kind The efficient closure works system of agricultural non-point source pollution and control method, closure works system include for being opened and closed the gate for the mouth that shuts off, regulating gate The headstock gear of opening and closing, ultrasonic open-channel meter and control unit.Ultrasonic open-channel meter is arranged in Vatch basin to be cut for measuring The flow of well water is flowed, output connects control unit;Control unit output end is connect with headstock gear, according to ultrasonic open channel flow rate The opening and closing that the flow detected passes through headstock gear regulating gate is counted, structure is simple, can change by difference in flow and shut off.Root According to agriculture irrigation ditch canal run-off and the correlation of DTP concentration and the occurrence law of peak concentration, controlled using flow and ageing Mode, realization shut off to agricultural area source sewage, can retain in the case where identical retention water to the full extent more Pollutant, more than existing stopped flow technique simple and effective.But this method only controls flow, does not relate to pollutant and goes It removes, the removal of pollution of area source total nitrogen is not related to.
Application number 201610237195.0, a kind of strength wind send long-range application equipment, are related to a kind of strength wind and send remotely to apply Medicine equipment, belongs to agricultural machinery technological field.The equipment includes the spray tank being supported in the rack with traction wheel, rack One end disposes power derived from the transmission shaft of dragger, and the other end disposes the hinged centrifugal blower on the rack of impeller shaft;Blower snail The air outlet of shell be equipped with water conservancy diversion air duct, water conservancy diversion air duct outlet top installation angle adjustable pod, pod outer end it is upper Side and downside are respectively provided with injecting-unit;Spray tank connects injecting-unit through pumping pressure piping, and transmission shaft is through shaft coupling and blower leaf Wheel transmission connection;Rack at blower is hinged with indexable hydraulic cylinder, and the piston rod outer end of hydraulic cylinder and volute of blower are hinged.But it should Method is only designed application equipment, is not directed to pollutant catabolic gene, does not relate to the control method of total nitrogen.
A kind of application number 201610152812.7, method of Hills And Low Mountains Control of Agricultural Non-point Source Pollution, provides one kind The system method of Hills And Low Mountains Control of Agricultural Non-point Source Pollution opens up wasteland hilly upland for counter-slope terrace land, every row terrace land holding etc. High level, terrace land of not going together are parallel to each other and perpendicular to inclined directions uphill;The system method includes: that source subtracts Amount, the Sources decreasing are the use of substitution with decrement chemical pesticide and decrement chemical fertilizer;Runoff is stopped, and the runoff is stopped To plant ground mulching plant in slope surface, back ditch and terraced wall in counter-slope terrace land outer slope planting plants hedge;Process control, it is described Process control setting Cut-off ditch, draining longitudinal furrow, back ditch, setting pot and sump and initial rainwater collection device, and form net Network;Nutrien utilization, the nutrien utilization include pretreatment unit and main body processing unit.But this method takes up a large area, throws The control that money is big, operating cost is high, shortage is to total nitrogen.
A kind of application number 201610019955.0, paddy fields agricultural non-point source pollution ecological treatment method, discloses one Paddy fields agricultural non-point source pollution ecological treatment method is planted, flows out farmland to entrance downstream receiving water body from agricultural non-point source pollution Whole process start with, propose three lines of defence specifically subtracts dirty technology, reduces agriculture with Water-saving Irrigation Management in Farmland and liquid manure comprehensive regulation The source control of industry pollution of area source discharge is the first line of defence, and ecological ditch is anti-for second to the removal purification of agricultural non-point source pollution Line, small reservoir wetland are three lines of defence to the removal purification of agricultural non-point source pollution, are series relationship, i.e. head end between three lines of defence For the first line of defence, next is connected to second defence line, is finally connected to three lines of defence.The method of the present invention is to agricultural area source dirt Nitrogen discharge and phosphorus discharge good purification in dye improves N,P use efficiency, and construction cost and operating cost are less expensive, enrich water Rice irrigated area Plant Diversity is suitble to be promoted in the area of southern rice cultivation.But this method takes up a large area, it is big to invest, Stablize removal poor, that shortage is to total nitrogen.
Application number 201510843816.5, a kind of sampler and its side for collecting agricultural non-point source pollution runoff sample Method discloses a kind of for collecting the sampler and its method of agricultural non-point source pollution runoff sample, including water inlet, shell, bottom Plate, spring and partition, on shell, outer casing bottom is equipped with bottom plate, fluid-tight for forming interior of shell for water inlet setting Confined space;Bottom plate is made of male seal plate and Extendible flake, and multi-disc Extendible flake, Extendible flake insertion are fixed on male seal plate In partition, the closed fluid-tight cooperation of the contact surface of Extendible flake and partition;Interior of shell is equipped with a plurality of hollow partition for shell Averagely it is divided into multiple isometric spaces.Spring in the device without water in the case where, so that device is kept closed, and in device When water level rises to certain altitude, device for opening is drained, and water inlet is divided into several equal portions, is thus reached and is both reduced diameter Fluid product, and can guarantee the purpose for obtaining the runoff mixing sample of normal precipitation, thus during greatly reducing runoff collection The runoff collecting pit size for needing to build, reduces costs and occupied area.But this method only relate to agricultural area source collector and Its method does not relate to the control of agricultural area source, and the control of especially total nitrogen is lack of pertinence.
Application number 201510821137.8, a method of the multiple sewage in country fair area being purified using the country fair area ditch pool ecosystem, More particularly to a kind of method using the country fair area ditch pool ecosystem purification multiple sewage in country fair area.Technique passes through to country fair area ditch pool form Renovation technique, country fair area ditch pool water system connection technology, Sediment rehabilitation renovation technique, aquatic animals and plants recovery technology, water plant are floating The integrated and optimization of the restorations of the ecosystem combination techniques such as bed reinforcement technique, constructs based on water correction, using restoration of the ecosystem as core The heart, the country fair area ditch pool system purification of water quality Introduction of The Comprehensive Regulating Works for taking into account landscape promotion.But this method accounts for, and removal effect is limited, ground Long-pending removal big, investment is big, operating cost is high, shortage is to total nitrogen.
Application number 201510594040.8, a kind of staged horizontal drowned flow artificial wet land combined system and its application.It is related to A kind of staged horizontal drowned flow artificial wet land combined system and its application, the combined system are built according to clinoform, including Multistage is dived according to the horizontal drowned flow artificial wet land unit of the from top to bottom stepped distribution setting of ramp slope and by levels at different levels The pipe network unit that artificial wetland unit is connected, horizontal drowned flow artificial wet land unit use lateral inflow mode, and horizontal The length direction bottom horizontal flow sheet of water flow in drowned flow artificial wet land unit along horizontal drowned flow artificial wet land unit.With prior art phase Break through the limitation that landform apply artificial swamp than, the invention, can make full use of hillside fields space, structure simply, easy construction, at This is cheap, can be widely applied to the sanitary sewage in the slopes area such as mountainous region, hills, water body sloping bank, municipal wastewater, industrial wastewater, All kinds of sewage treatments such as animal husbandry sewage, agricultural non-point source pollution, rainwash, sewage treatment plant tail water have greatly expanded artificial The application range of wetland.But this method artificial swamp takes up a large area, invests the removal that big, operating cost is high, shortage is to total nitrogen Specific aim.
Summary of the invention
, variation big, widespread feature seriously polluted for Total Nitrogen, the present invention provides a kind of modularization farmland rows Water cascade purifies total nitrogen and removes system and method.According to Total Nitrogen pollution intensity size, module can be flexibly increased and decreased Change the quantity of S pattern block denitrification purification system, optimizes denitrifying bacteria population structure.According to water flow stream in agriculture drainage ditch Fast size increases and decreases replaceable weir plate 4-3 quantity in nitrification purification system, extends the residence time, improves dissolved oxygen and water Dynamic condition improves nitrification effect.Invention enhances the removal of agricultural drain total nitrogen, treatment effeciency is high, stability is good, operation Convenient for management, occupied area is small, cost of investment is low, and ecological environment is good.
Technical solution: the purpose of the present invention is achieved through the following technical solutions:
A kind of modularization agricultural drain step purification total nitrogen removes system, including sequentially connected farmland 1, S pattern block are anti- It nitrifies purification system, ecological ditch and step and nitrifies purification system.
Wherein S pattern block denitrification purification system includes side board, intermediate bulkhead and denitrification purifying area;Side board Surround section be S type module denitrification purification system, muti-piece intermediate bulkhead 2-2 divide S pattern block denitrification purification system at Multiple denitrification purifying area 2-3.S pattern block denitrification purification system section is L-shaped (including vertical farmland direction and to flow downstream Direction two parts), it arranges by water (flow) direction in step, successively reduces.6~8m of total length, wherein 1 direction of vertical farmland and downstream Flow direction length ratio 1:1,0.8~1.2m of width, the drainage direction gradient 3%;0.5~0.8m of depth.
Side board and intermediate bulkhead material are virgin wood, plate thickness 8mm~12mm, the interval intermediate bulkhead 2-2 0.6~ 0.8m, height 0.3-0.6m, adjacent intermediate diaphragm centre are denitrification purifying area 2-3.Denitrification purifying area residence time 4-6h, Nitrogen removal rate 35~66%.
The quantity of S pattern block denitrification purification system can be rationally set according to Different Irrigation phase total nitrogen concentration, when TN < When 25mg/L, using 1 group of purification system of S pattern block denitrification;25mg/L≤TN < 35mg/L is purified using S pattern block denitrification Totally 2 groups of system;35mg/L≤TN < 40mg/L, using totally 3 groups of purification system of S pattern block denitrification;TN >=40mg/L or more is adopted With totally 4 groups or more of purification system of S pattern block denitrification.
Ecological ditch includes plant purification area and adjusts weir plate, and ecological ditch end setting adjusts weir plate, and regulating weir board width is same Plant purification area;Plant purification sector width is 4~8m, gradient 1:1~1:2, the emergent aquactic plants such as side slope plantation reed, iris, kind 20~30 plants/m of density in planting2.Plant purification area 12~16h of residence time.
The cross section diameter of step nitrification is less than the cross section diameter of ecological ditch.Including nitrification purifying area, fixed weir plate, can Replace weir plate;Step nitrification is divided into multiple nitrification purifying areas by fixed weir plate;Nitrification purification sector width is 2~4m, slope 1:1~1:2 is spent, nitrification purifying area is separated by fixed weir plate and replaceable weir plate, and fixed weir plate and replaceable weir plate ratio are 1:1 arranges in step by water (flow) direction, successively reduces.0.4~0.6m of replaceable weir plate height.Nitrify the purifying area residence time 8 ~14h, ammonia nitrogen removal frank 55~75%.It is net can to increase and decrease nitrification according to flow rate of water flow size in agriculture drainage ditch Replaceable weir plate quantity in change system extends the residence time, improves dissolved oxygen and hydrodynamic condition, improves nitrification effect.It can be more The section of weir plate is changed in U shape, the section of fixed weir plate is in dumbbell shape.
A kind of modularization agricultural drain step purification total nitrogen minimizing technology, comprising the following steps:
Step 1, agricultural drain initially enter S pattern block denitrification purification system, and sewage is extended by intermediate bulkhead to stop Time provides basis for denitrifying bacterium.Abundant denitrification is obtained in denitrification purifying area;Agricultural drain water quality is pH 6~9, 15~35mg/L of ammonia nitrogen, TN 25mg/L~50mg/L.
Step 2, the water outlet of S pattern block denitrification purification system enter ecological ditch, pass through plant in the plant purification area of ecological ditch Absorption, the conversion of object reduce the nitrate pollution in draining, while adjusting weir plate and adjusting liquid level, improve the residence time.
Step 3, ecological ditch water outlet enter step and nitrify purification system, by reducing water in step nitrification purification system Section increased water flow velocity, increased dissolved oxygen, improved the denitrogenation of nitrifier in nitrification purifying area.
In step 4, step nitrification purification system, it is more than 20mg/L when being discharged TN concentration, starts to flow back, reflux ratio 80%~ 200%.Effluent quality TN≤15mg/L.Control 0.2~0.3m/s of flow velocity, 2~4mg/ of dissolved oxygen DO in step nitrification 4 L。
Compared with the prior art, the present invention has the advantages that
1, the present invention is to strengthen nitrifier and denitrifying bacterium microorganism removal total nitrogen as core.It improves dissolved oxygen concentration and changes Kind HYDRODYNAMIC CONDITION RELATING TO, improves nitrification effect.Increase denitrification residence time and modularization denitrification purification system quantity, improves anti- Nitrification effect.Final efficient, the steady removal for realizing total nitrogen.
2, occupied area is small, invests, convenient operation and management low with operating cost.The present invention is based on purified in situ, devise S Pattern block denitrification purification system, ecological ditch and step nitrify three parts of purification system.It is set according to the concentration of total nitrogen in draining It counts the cleaning module of different number: modularization S pattern block can flexibly be increased and decreased according to Total Nitrogen pollution intensity size The quantity of denitrification purification system optimizes denitrifying bacteria population structure.According to flow rate of water flow size in agriculture drainage ditch, increase Adduction reduces replaceable weir plate 4-3 quantity in nitrification purification system, extends the residence time, improves dissolved oxygen and hydrodynamic condition, Improve nitrification effect.
3, removal effect is good, TN concentration≤15mg/L, removal rate nitrogen removal rate 35~66%.Operating cost is lower than 0.2 Yuan/ton.Effectively solve the problems, such as farmland total nitrogen contamination control.
Detailed description of the invention
Fig. 1 is the annexation figure that a kind of modularization agricultural drain step purifies that total nitrogen removes system;
Fig. 2 is the floor plan that a kind of modularization agricultural drain step purifies that total nitrogen removes system;
Fig. 3 is that a kind of modularization agricultural drain step purifies total nitrogen minimizing technology A-A sectional view;
Fig. 4 is that a kind of modularization agricultural drain step purifies total nitrogen minimizing technology B-B sectional view;
Fig. 5 is that a kind of modularization agricultural drain step purifies total nitrogen minimizing technology C-C sectional view;
In figure: farmland -1, S pattern block denitrification purification system -2, ecological ditch -3, step nitrify purification system -4;S pattern The side board of block denitrification purification system: 2-1, intermediate bulkhead: 2-2 and module denitrification purifying area: 2-3;The plant of ecological ditch Object purifying area: 3-1, weir plate: 3-2 is adjusted;The nitrification purifying area of step nitrification purification system: 4-1, fixed weir plate: 4-2, can be more Change weir plate: 4-3.
Specific embodiment
Technical solution of the present invention is further described by following specific embodiment.
Embodiment 1
Referring to Fig.1-5, a kind of modularization agricultural drain step purification total nitrogen removal system, including sequentially connected farmland 1, S pattern block denitrification purification system 2, ecological ditch 3 and step nitrify purification system 4.
Wherein S pattern block denitrification purification system 2 includes side board 2-1, intermediate bulkhead 2-2 and denitrification purifying area 2- 3;Side board 2-1 surrounds the module denitrification purification system that section is S type, and muti-piece intermediate bulkhead 2-2 divides the anti-nitre of S pattern block Change purification system into multiple denitrification purifying area 2-3.L-shaped (including the vertical farmland in S pattern block denitrification purification system section Direction and Parallel to the flow direction two parts), it arranges by water (flow) direction in step, successively reduces.6~8m of total length, wherein vertical agriculture 1 direction of field and Parallel to the flow direction length ratio 1:1,0.8~1.2m of width, the drainage direction gradient 3%;0.5~0.8m of depth.
Side board 2-1 and intermediate bulkhead 2-2 material are virgin wood, plate thickness 8mm~12mm, the interval intermediate bulkhead 2-2 0.6~0.8m, height 0.3-0.6m, the centre adjacent intermediate diaphragm 2-2 is denitrification purifying area 2-3.Denitrification purifying area 2-3 stops Stay time 4-6h, nitrogen removal rate 35~66%.
The quantity of S pattern block denitrification purification system can be rationally set according to Different Irrigation phase total nitrogen concentration, when TN < When 25mg/L, using 1 group of purification system of S pattern block denitrification;25mg/L≤TN < 35mg/L is purified using S pattern block denitrification Totally 2 groups of system;35mg/L≤TN < 40mg/L, using totally 3 groups of purification system of S pattern block denitrification;TN >=40mg/L or more is adopted With totally 4 groups or more of purification system of S pattern block denitrification.
Ecological ditch 3 includes plant purification area 3-1 and adjusts weir plate 3-2, and ecological 3 end of ditch setting adjusts weir plate 3-2, adjusts Weir plate width is the same as plant purification area 3-1;Plant purification area 3-1 width is 4~8m, gradient 1:1~1:2, side slope plantation reed, kite The emergent aquactic plants such as tail, 20~30 plants/m of planting density2.Plant purification area 3-1 12~16h of residence time.
The cross section diameter of step nitrification 4 is less than the cross section diameter of ecological ditch 3.Including nitrifying purifying area 4-1, fixed weir Plate 4-2, replaceable weir plate 4-3;Step nitrification 4 is divided into multiple nitrification purifying area 4-1 by fixed weir plate 4-2;Nitrification is net Change area 4-1 width is 2~4m, gradient 1:1~1:2, nitrification purifying area 4-1 pass through fixed weir plate 4-2 and replaceable weir plate 4-3 every It opens, fixed weir plate 4-2 and replaceable weir plate 4-3 ratio are 1:1, arrange by water (flow) direction in step, successively reduce.Replaceable weir 0.4~0.6m of plate 4-3 height.Nitrify purifying area 4-1 8~14h of residence time, ammonia nitrogen removal frank 55~75%.It can be according to agriculture Flow rate of water flow size in the drainage ditch of field increases and decreases replaceable weir plate 4-3 quantity in nitrification purification system, when extending stop Between, improve dissolved oxygen and hydrodynamic condition, improve nitrification effect.The section of replaceable weir plate 4-3 is in U shape, fixed weir plate The section of 4-2 is in dumbbell shape.
A kind of modularization agricultural drain step purification total nitrogen minimizing technology, comprising the following steps:
Step 1, the draining of farmland 1 initially enter S pattern block denitrification purification system 2, and sewage is extended by intermediate bulkhead 2-2 Residence time provides basis for denitrifying bacterium.Abundant denitrification is obtained in denitrification purifying area 2-3;, farmland 1 drains water quality For pH 6~9,15~35mg/L of ammonia nitrogen, TN 25mg/L~50mg/L.
Step 2, the water outlet of S pattern block denitrification purification system 2 enter ecological ditch 3, in the plant purification area 3-1 of ecological ditch 3 The nitrate pollution in draining is reduced by the absorption of plant, conversion, while adjusting liquid in the adjusting weir plate 3-2 of ecological ditch 3 setting The residence time is improved in position.
Step 3, the ecological water outlet of ditch 3 enter step and nitrify purification system 4, pass through diminution in step nitrification purification system 4 The cross-section of river increased water flow velocity, increased dissolved oxygen, improved the denitrogenation of nitrifier in nitrification purifying area 4-1.
In step 4, step nitrification purification system 4, it is more than 20mg/L when being discharged TN concentration, starts to flow back, reflux ratio 80% ~200%.Effluent quality TN≤15mg/L.0.2~0.3m/s of flow velocity in control step nitrification 4, dissolved oxygen DO 2~ 4mg/L。
Embodiment 1
15 mu of certain farmland area.
A kind of modularization agricultural drain step purification total nitrogen removes system, including sequentially connected farmland 1, S pattern block are anti- It nitrifies purification system 2, ecological ditch 3 and step and nitrifies purification system 4.2 l-shaped of S pattern block denitrification purification system, by water flow side It arranges in step, successively reduces.Total length 8m, wherein 1 direction of vertical farmland and Parallel to the flow direction length ratio 1:1, width 1.0m, the drainage direction gradient 3%;Depth 0.5m.Side board 2-1 and intermediate bulkhead 2-2 material are virgin wood, plate thickness It is denitrification purifying area 2-3 among 10mm, intermediate bulkhead 2-2 interval 0.8m, height 0.5m, intermediate bulkhead 2-2.Denitrification purification Area 2-3 residence time 5h.
Plant purification area 3-1 width is 6m, gradient 1:2, the emergent aquactic plants such as side slope plantation reed, iris, kind in ecological ditch 3 30 plants/m of density in planting2.Plant purification area 3-1 residence time 16h.Ecological 3 end of ditch setting adjusts weir plate 3-2, and it is wide to adjust weir plate Degree is the same as plant purification area 3-1.
It is 4m, gradient 1:2 that step, which nitrifies nitrification purifying area 4-1 width in purification system 4, and nitrification purifying area 4-1 passes through solid Determine weir plate 4-2 and replaceable weir plate 4-3 is separated, fixed weir plate 4-2 and replaceable weir plate 4-3 ratio are 1:1, are in by water (flow) direction Step arrangement, successively reduces.Replaceable weir plate 4-3 height 0.5m.Nitrify purifying area 4-1 residence time 12h.
Purify total nitrogen the following steps are included:
Step 1, the draining of farmland 1 initially enter S pattern block denitrification purification system 2, and sewage is extended by intermediate bulkhead 2-2 Residence time provides basis for denitrifying bacterium.Abundant denitrification is obtained in denitrification purifying area 2-3.
Step 2, the water outlet of S pattern block denitrification purification system 2 enter ecological ditch 3, the plant purification area 3-1 in ecological ditch 3 The nitrate pollution in draining is reduced by the absorption of plant, conversion, while adjusting liquid in the adjusting weir plate 3-2 of ecological ditch 3 setting The residence time is improved in position.
Step 3, the ecological water outlet of ditch 3 enter step and nitrify purification system 4, pass through diminution in step nitrification purification system 4 The cross-section of river increased water flow velocity, increased dissolved oxygen, improved the denitrogenation of nitrifier in nitrification purifying area 4-1.
Step 4, step nitrification purification system 4 are more than 20mg/L when being discharged TN concentration, start to flow back, and reflux ratio 80%~ 200%.Control 0.2~0.3m/s of flow velocity, 2~4mg/L of dissolved oxygen DO in step nitrification 4.
It is total using 1 group of S pattern block denitrification purification system 2 as TN < 25mg/L;
The water quality situation that this method administers front and back is shown in Table 1.
1 embodiment 1 of table administers front and back water quality situation
Index pH Total nitrogen content TN (mg/L) NH3-N(mg/L)
Before improvement 6~9 22 15.6
After improvement 6~9 10.8 3.5
Removal rate - 74.6% 70%
Embodiment 2
Other are the same as embodiment 1.
25mg/L≤TN < 35mg/L, using totally 2 groups of S pattern block denitrification purification system 2;Administer the water quality situation of front and back It is shown in Table 2.
2 embodiment 2 of table administers front and back water quality situation
Index pH Total nitrogen content TN (mg/L) NH3-N(mg/L)
Before improvement 6~9 22 15.6
After improvement 6~9 10.8 3.5
Removal rate - 74.6% 70%
Embodiment 3
Other are the same as embodiment 1.
35mg/L≤TN < 40mg/L, using totally 3 groups of S pattern block denitrification purification system 2;Administer the water quality situation of front and back It is shown in Table 3.
3 embodiment 3 of table administers front and back water quality situation
Embodiment 4
Other are the same as embodiment 1.
TN >=40mg/L or more, using totally 4 groups or more of S pattern block denitrification purification system 2.Administer the water quality situation of front and back It is shown in Table 4.
4 embodiment 4 of table administers front and back water quality situation
Index pH Total nitrogen content TN (mg/L) NH3-N(mg/L)
Before improvement 6~9 44.6 20.7
After improvement 6~9 10.8 3.5
Removal rate - 74.6% 70%

Claims (7)

1. a kind of modularization agricultural drain step purification total nitrogen removes system, which is characterized in that including sequentially connected farmland, S Pattern block denitrification purification system, ecological ditch and step nitrify purification system, and step nitrifies the output end of purification system through flowing back Pipeline is connect with the input terminal of S pattern block denitrification purification system;
Wherein S pattern block denitrification purification system includes side board, intermediate bulkhead and denitrification purifying area;Side board surrounds Section is the module denitrification purification system of S type, and muti-piece intermediate bulkhead divides S pattern block denitrification purification system into multiple anti-nitre Change purifying area;S pattern block denitrification purification system includes vertical farmland direction and Parallel to the flow direction two parts, and section is L-shaped, Wherein vertical 1 direction of farmland and Parallel to the flow direction length ratio 1:1;
Ecological ditch includes plant purification area and adjusts weir plate, and ecological ditch end setting adjusts weir plate, the same plant of regulating weir board width Purifying area;Plant purification area side slope plants emergent aquactic plant;
Step nitrification includes nitrification purifying area, fixed weir plate, replaceable weir plate;Fixed weir plate separates step nitrification For multiple nitrification purifying areas;The cross section diameter of step nitrification is less than the cross section diameter of ecological ditch.
2. a kind of modularization agricultural drain step purification total nitrogen described in claim 1 removes system, which is characterized in that S pattern The side board and intermediate bulkhead material of block denitrification purification system are virgin wood, plate thickness 8mm~12mm, intermediate bulkhead interval 0.6~0.8m, 0.3~0.6m of height.
3. a kind of modularization agricultural drain step purification total nitrogen described in claim 1 removes system, it is characterised in that S pattern block The quantity of denitrification purification system is arranged according to Different Irrigation phase total nitrogen concentration, as TN < 25mg/L, using the anti-nitre of S pattern block Change 1 group of purification system;25mg/L≤TN < 35mg/L, using totally 2 groups of purification system of S pattern block denitrification;35mg/L≤TN< 40mg/L, using totally 3 groups of purification system of S pattern block denitrification;TN >=40mg/L or more purifies system using S pattern block denitrification Altogether 4 groups or more.
4. a kind of modularization agricultural drain step purification total nitrogen described in claim 1 removes system, which is characterized in that ecological ditch Plant purification sector width be 4~8m, the emergent aquactic plant of gradient 1:1~1:2, side slope plantation are reed or iris, are planted close Spend 20~30 plants/m2
5. a kind of modularization agricultural drain step purification total nitrogen described in claim 1 removes system, it is characterised in that step nitre The nitrification purification sector width of change system is 2~4m, gradient 1:1~1:2, and fixed weir plate and replaceable weir plate quantitative proportion are 1:1, It arranges by water (flow) direction in step, successively reduces;The section of replaceable weir plate is in U shape, and the section of fixed weir plate is in dumbbell Type.
6. based on the total nitrogen minimizing technology of modularization agricultural drain step described in claim 1 purification total nitrogen removal system, packet Include following steps:
Step 1, agricultural drain initially enter S pattern block denitrification purification system, and sewage extends the residence time by intermediate bulkhead, Basis is provided for denitrifying bacterium, abundant denitrification is obtained in denitrification purifying area;
Step 2, the water outlet of S pattern block denitrification purification system enter ecological ditch, pass through plant in the plant purification area of ecological ditch It absorbs, the nitrate pollution in conversion reduction draining, while adjusting liquid level, raising residence time by adjusting weir plate;
Step 3, ecological ditch water outlet enter step and nitrify purification system, and the cross-section of river reduces in step nitrification purification system, increase Add water flow velocity, and increased dissolved oxygen, and improves the denitrogenation of nitrifier in nitrification purifying area;
In step 4, step nitrification purification system, it is more than 20mg/L when being discharged TN concentration, starts to flow back, reflux ratio 80%~ 200%.Effluent quality TN≤15mg/L;Control 0.2~0.3m/s of flow velocity, 2~4mg/L of dissolved oxygen DO in step nitrification.
7. modularization agricultural drain step as claimed in claim 6 purifies total nitrogen minimizing technology, which is characterized in that in step 1, agriculture Field drain water quality be pH 6~9,15~35mg/L of ammonia nitrogen, TN 25mg/L~50mg/L, the denitrification purifying area residence time 4~ 6h, nitrogen removal rate 35~66%;In step 2, plant purification area 12~16h of residence time;The nitrification purifying area residence time 8~ 14h, ammonia nitrogen removal frank 55~75%.
CN201811090868.XA 2018-09-19 2018-09-19 Modular farmland drainage stepped purification total nitrogen removal system and method Active CN109231464B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811090868.XA CN109231464B (en) 2018-09-19 2018-09-19 Modular farmland drainage stepped purification total nitrogen removal system and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811090868.XA CN109231464B (en) 2018-09-19 2018-09-19 Modular farmland drainage stepped purification total nitrogen removal system and method

Publications (2)

Publication Number Publication Date
CN109231464A true CN109231464A (en) 2019-01-18
CN109231464B CN109231464B (en) 2020-02-07

Family

ID=65059359

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811090868.XA Active CN109231464B (en) 2018-09-19 2018-09-19 Modular farmland drainage stepped purification total nitrogen removal system and method

Country Status (1)

Country Link
CN (1) CN109231464B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109607885A (en) * 2019-02-19 2019-04-12 北京林业大学 A kind of water treatment technology generated based on graphene-based material absorption/catalysis oxidation step coupling control bromate

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050082222A1 (en) * 2003-10-20 2005-04-21 Dharma Living Systems, Lc Tidal vertical flow wastewater treatment system and method
US20080251448A1 (en) * 2007-04-13 2008-10-16 Kent Greg B In line wetland water treatment system and method
CN103435234A (en) * 2013-09-12 2013-12-11 中国科学院亚热带农业生态研究所 Method for reducing and controlling waste pollutants in scattered culture zones of hills
CN104944590A (en) * 2015-06-24 2015-09-30 浙江海洋学院 Rural non-point source sewage treatment multi-layer ladder seepage drainage and non-point source sewage treatment process
CN105217901A (en) * 2015-11-21 2016-01-06 杭州绿夏环境科技有限公司 A kind of method of wastewater biochemical removing total nitrogen
CN107047266A (en) * 2017-01-24 2017-08-18 河海大学 A kind of industrial crops band for agriculture irrigated area irrigation canals and ditches pollutant fluxes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050082222A1 (en) * 2003-10-20 2005-04-21 Dharma Living Systems, Lc Tidal vertical flow wastewater treatment system and method
US20080251448A1 (en) * 2007-04-13 2008-10-16 Kent Greg B In line wetland water treatment system and method
CN103435234A (en) * 2013-09-12 2013-12-11 中国科学院亚热带农业生态研究所 Method for reducing and controlling waste pollutants in scattered culture zones of hills
CN104944590A (en) * 2015-06-24 2015-09-30 浙江海洋学院 Rural non-point source sewage treatment multi-layer ladder seepage drainage and non-point source sewage treatment process
CN105217901A (en) * 2015-11-21 2016-01-06 杭州绿夏环境科技有限公司 A kind of method of wastewater biochemical removing total nitrogen
CN107047266A (en) * 2017-01-24 2017-08-18 河海大学 A kind of industrial crops band for agriculture irrigated area irrigation canals and ditches pollutant fluxes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109607885A (en) * 2019-02-19 2019-04-12 北京林业大学 A kind of water treatment technology generated based on graphene-based material absorption/catalysis oxidation step coupling control bromate

Also Published As

Publication number Publication date
CN109231464B (en) 2020-02-07

Similar Documents

Publication Publication Date Title
CN103880257B (en) The ecologic assemblage treatment process of a kind of rural area decentralized type sewage and device
CN100398465C (en) Composite artificial marshland water quality clarification system in north low-temperature area
CN105967339B (en) A kind of method and device of the ecological pond purified treatment of heavy metal pollution irrigation water
CN107487854B (en) Method and system for treating agricultural non-point source pollutants in hilly area by using multistage wetland
CN104891661A (en) Artificial paddy wetland system and method for controlling the non-point source pollution of paddy field
CN102976494A (en) Multi-habitat ecological pond system
CN110386666A (en) A kind of compound pool system of free water surface wetland-for sewage treatment
Dong et al. Irrigation ponds: Possibility and potentials for the treatment of drainage water from paddy fields in Zhanghe Irrigation System
CN105293841B (en) A kind of artificial swamp and filtration system combined depth handles country sewage method and device
CN109231464A (en) A kind of modularization agricultural drain step purification total nitrogen removal system and method
CN204752475U (en) Unpowered ecological sewage treatment system
CN109160611A (en) A kind of multi-stage eco-ponds system for collecting processing suitable for small watershed in mountain non-point pollution
CN105344707A (en) Forest network enrichment-conversion irrigation and drainage circulating system used for removing heavy metal of strip field
CN103469761A (en) Farmland runoff loss nutrient recycling system and application
CN105152469A (en) Method for treating aquaculture tail water in integrated manner
CN200951977Y (en) Quasi-aerobic subcurrent artificial wet land
CN206033489U (en) Ecological ditch canal clean system is inlayed in step paddy field that agricultural non -point source pollution administered
CN109493707A (en) The city planning model of weir pool type sponge community in urban areas
CN205773894U (en) Separate system rain processing system associated with a kind of magnetic flocculation-front damming
CN109455877A (en) A kind of country sewage water purification system and purification method
CN108191054A (en) The Ecological Control system and construction method of rural comprehensive pollution of area source
CN108623007A (en) A kind of multi-stage eco-ponds improvement rural rivers method
CN106115925A (en) The widespread pollution from the overuse of fertilizers and pesticides in rural area cleaning system that step rice field organically combines with ecological canal
CN102910783A (en) Artificial wetland micro power treating system applied to rural biological sewage
CN207252361U (en) Suitable for the water circulation system of agricultural production

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant